Embroidering machine



7 July 28, 1925.

' 1,547,930 7 R.- LOEB EMBhOIDERING MACHINE I Filed Oct. 8, 1923 5 Sheets-Shee t -1.

July 28,1925. I 1,547,930

R. LOEB EMBROIDERING MACHINE Filed Oct. 8, 1923 I 5 Sheets-Sheet 2 R. LOEB July 28,1925. I 1,547,930"

. EMBROIDERING MACHINE Filed Oct. 8, 1 925 5 Sheets-Sheet 3 W flwZo 110155 5 L7 Mm/1 1 July 28, 1925.

Filed Oct. 8, 1925" 5 sheets-sheet 4 lafiz. 5 %W R. LOEB EMBROIDERI NG MACHINE .July 28,1925. 1,547,930

Filedvoct. 8, 1925 5 Sheets-Sheet 5 Patented July 28, 1 925.

siren stares new RUDOLF LOEIB, o JENK NT WN.maneuver-1A. ass-isms To ,LQEB- & 'wasofl on- BANY, we. or CAMD N. NEW JERSEY, a CORPQHATION- OF NEW mesmmsnornname MACHINE.

Application filed October 8, 1923. *saa no. eemsv;

To all whom it may concern:

Be it-known that I, Rnnonr Lone, a citizen of the United States, residing in llenkinchines for forming scallops on the edges of fabric, such as disclosed in the patent granted to me on the 9th day of April, 19-18, No. 1,262,070. In this patent, the loops that form the scallops are made over a reciproeating wedge-shaped former and the movement of the wedge determines the length of the loops.

The object of the present invention is to form the loops on a prong, which is lined in relation to the needle and the looper, and to vary the length of the loops by a variable tension, whichis' operated automatically to produce a series of scallopsat the edge of a piece of fabric.

In the accompanying drawings: I

Fig. 1 is a plan view of a machine embodying my invention;

Fig. 2 is a side elevation of the machine;

Fig. 3 is afront elevation;

Fig. 4: is an enlarged side view of the presser foot;

Fig. 5 is a plan view of the presser foot;

Fig. 6 is an inverted plan view of the same; i

Fig. 7 is a perspective view of the presser foot; I

Fig. 8 is a perspective view of the presser foot and cutter, showing the formation of the scallops at the edge of a piece of fabric;

Figs. 9 to 18, both inclusive, are diagrams showing the formation of a stitch;

Fig. 19 is a sectional view showing a long loop; Fig. 20 is a sectional view showing a short loop; and 7 Figs. 21 and 22 are views showing the formation of the long and short loops.

Referring to the drawings, 1 is thebase of a sewing machine of the type illustrated in the patent granted to VVillcoX & Borton, 2 designates the work plate and 3 designates the needle bar. 4 designates the presser bar, which carries the 'foot 5. 6 designates the cutter bar, on which is mounted the knife 7 that cutsthe edge of the fabric in advance of the looping mechanism. 8 designates the main shaft, which is shown by dotted lines in Fig. 2'. On this shaft a worm 9 that has ahand grip 10 by which the. shaft can be turned manually.

"The worm 9 meshes with, a worm wheel 11 on a shaft 12. On this shaft is an eccentric 13 for imparting a reciprocating movement to a slide 14; through a rod 15'. In theslide '14 is a cam groove 16. i

'17 designates a vertical rod, having a roller located in the groove 16. On the'upper end of the rod is an arm 18, which is at- 'taohed to a slide 19 that is mounted in ways 20, on a bracket 22, which projects from the frame of the machine. I

block can. be adjusted to any angular posi- 1 tion desired. E'xtendinginto' the groove is a'roller25-,which is carried, by an arm 26 of the slide rod 17. The long arm ofthe bellcrank lever 23 has an adjusting screw 27,

. which rests upon the end 'of' aspring-p'ressed tension post'-28 that controls the tension dislrs 29 for the looper thread a. The thread a passes from a tension device 31, which can be adjusted by hand. The looper 30 is shown by dotted lines in Fig. 2, and in Figs.

9to 18, both inclusive.

The needle thread 12 passes through the tension device 32, and through guides 33 and 34 to the needle 35, which is carried by the needle bar 3.

The presser foot is made as clearly shown in Figs. 4 to 7, both inclusive. The foot has a recess 36 for the passage of the needle and the looper. Extending into this recess from the front is a loop-engaging prong 37, over which the loop is cast. ,The needle passes through the loop to make the stitch. The length of the loop is determined by the variable tension member, which is con-v trolled by the slide 19. As the slide is raised by its cam 16, it turns the bell-crank lever 23 on its pivot, which allows the tension post 28 to be raised to the desired extent. When the slide is lowered, the bellpost 28, thus increasing the tension.

crank lever presses down upon the tension The formation of the stitch is shown fixed prong 37, while the needle passes its thread through a loop of the looper thread and through the fabric. The looper engages the needle thread under the fabric and forms a loop at the scalloped edge. This is repeated, as the loops are formed. A long loop is shown in Fig. 19 and a short loop is shown in Fig. 20.

In the formation of the loops to produce the scallops, the loops of the thread are formed over the fixed prong 37. The long loops of the scallop are produced with practically no tension and remain the full length, as formed, as in Fig. 21. The next loop is formed in a manner similar to the first loop, but the tension is slightly increased, which draws the loop towards the end of the tapered prong, so that it is shorter than the first loop. The third loop is made in the same manner, only the tension is increased, which draws the loop farther down upon the prong, thereby shortening it. The extreme tension is applied to the fourth loop so that it is drawn to the extreme point of the prong and is short, as shown in Fig. 22. As the process continues, the tension is gradually decreased and the loops are gradually lengthened until a full loop is formed without tension, producing a scalloped edge, such as shown in Fig. 8, with the aid of a fixed prong and variable tension mechanism.

In drawing the short loops, the edge of the fabric is drawn in with the loops, as shown clearly in Figs. 21 and 22. The size of the scallops and the form may be varied by shifting the block 24* on its arm by means of screws 24 This block controls the tension of the looper thread.

I claim:

1. The combination in a machine for making an over-edge scalloped edging on a fair ric, of a fixed prong; a needle and a looper for making a stitch at the edge of the fabric, said prong being so located that a loop is formed thereon; tension mechanism, so timed as to draw the loop as it leaves the prong; and means for automatically vary ing the tension to form long and short loops, thereby producing scallops at the edge of the fabric.

2. The combination in a machine for making over-edge, scalloped edging on a fabric, of a presser foot having a fixed prong; a needle and a looper for producing a stitch over the prong; a cutter located in advance of the prong; means for feeding the fabric; variable tension means for the looper thread; and automatic means for regularly varying the tension so as to form a series of loops of different lengths, thereby producing scallops at the edge of the fabric.

3. The combination in a machine "for making scalloped edging on a fabric; of a presser toot having a fixed, tapered prong; a needle and a looper for producing a stitch over the prong; tension mechanism; and means for automatically actuating the tension mechanism to vary the tension, the long stitches being formed with comparatively little tension, and the short stitches being formed by the tension drawing the loops to- .vards the point of the prong.

RUDOLF LOEB. 

